IDE: mode matrix: fixed updating storagegroups after undo/redo

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41518 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: comment

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41519 4005530d-fff6-0310-9dd1-cebe43e6787f